Medical officials are sounding the alarm that head lice may become a disgusting nuisance for many children and adults who are trying on Halloween costumes. According to reports, doctors see a spike in head lice cases this time of year. While many blame the start of a new school year, the biggest culprit is actually Halloween costume shopping. The conclusion becomes even more ghoulish when you think of how many people may have tried on your mask or wig in the store before you bought it.